A person who gives advice for mental disorders, emotional disorders, or any other mental illness and has no known background knowledge of psychology. More than just advice with no clinical know how.
Some dude gave me advice on eating disorders at Mac D's and claimed that the food additives had addictive properties creating a mental cycle of "food abuse". I asked if he was some kind of armchair psychologist or a something, grabbed my number one with cheese and bounced. Fucker was right or was he?